Method of briqueting iron ores and the like.



UNITED. STATES PATENT oFFIcE.

GEOBG CRUSIUS, OF GROSS-ILSEDE, GERMANY.

METHOD OF ERIQUETING IRON ORES AND THE LIKE.

1 116,024. No Drawing.

To all whom it may concern:

Be it known that I, GEonG GRUsms, a subject of the German Emperor, and resident of Gross-Ilsede, in the German Empire, have invented an Improved and Novel Method of Briqueting Iron Ores and the-like, of which the following is a specification.

This invention relates to a method of briqueting iron ores, Thomas slag, residues of such, and particularly also such materials as are not binding per se.

Specification of Letters Patent.

Application filed November 29, 1918. Serial No. 803,640.

- The gist of the invention resides in mix-' ingthe ores or other material with a tar that has been freed of water and all light and middle oils, the mixed substances being then ptessed, as is more fully described hereina er.

In the briqueting methods employed up to now, either no binding means were made use of, or ordinary tar or soft pitch was used. The employment of these binding -means was, however, connected with a' variety of drawbacks; for instance, the light and medium oils got distilled off already at very low temperatures so that they had no reducing effect upon the ores and were thus not properly utilized for the smelting process. In fact, the presenceof the oils escaping duringthe process has a noxious effect, because the briquet is made loose and loses consequently in solidity just by the early escape of the oils in question. In contradistinction to this, the iron ores or other materials are treated with tar which is already deprived of water, as well as of the light and the middle oils. This is very advantageous. The oils allow of a highly profitable utilization of their own, whereas the tar product obtained contains solely the heavy oils and remains-thinly liquid in spite of that. The thus treated tar is more easily and more intimately mixable with the materials to be briqueted,apart from the further advantage that the heavy oils present within the tar and thus within the mixture get to the outer surface of the briquet during'the finished briquets from the same.

'Patented Nov. 3, 1914.

face, improving thereby the appearance of the briquet, and acting in the mold like a grease thus facilitating removing the The briquets produced in this way are completely weather-proof and resist the heaviest rain, as well as the strongest frost, during being stored, as well as during transport, without the slightest injury whatever. The reductibility of the ores mixed with the tar treated in the manner in question is considerably increased, and\ coke is saved during the reductionbecause the tar has carbon as a component and its action and effect are more energetic because of the immediate reduction of the finely divided coke present in the briquet. Also the porosity of the briquets is improved without any damage to their solidity, that increase of the porosity being due to the fact that the briquets when dropping within the blast furnace are freely exposed to the reducing action of the blast furnace gases arising in consequence of the natural coking process of the added tar. (The gases arising act upon the adjacent charge and assist the reducing effect of the blast furnace gases.) Finally, the porous briquets offer the greatest imaginable con- GEORG ORUSIUS.

Witnesses:

- KARL GULJAHR. I -T. HENDY RE D. 

